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用点滴法和浸叶法测定了新疆阿拉尔棉铃虫田间自然种群（ＡＬ种群）３龄、４龄幼虫和初孵幼虫对拟除虫菊酯、有机磷、氨基甲酸酯和有机氯４类１４种常用农药的毒力反应，并与国内外已知敏感基线进行比较。结果表明，该种群处于高敏感水平，３龄幼虫的ＬＤ５０接近内地敏感种群或比内地敏感种群更低；在供试药剂中灭多威、氰戊菊酯、甲基对硫磷、久效磷和辛硫磷相对毒力指数仅为０１６～０５；与印度、澳大利亚、泰国、印度尼西亚等国的敏感品系相比，ＡＬ种群４龄幼虫的ＬＤ５０明显较低。在供试的８种药剂中，除甲基对硫磷外，灭多威、西维因、氯氰菊酯、久效磷、溴氰菊酯、氰戊菊酯、硫丹的相对毒力指数仅为００９～０４。试验还用浸叶法测定了常用杀虫剂对该敏感种群初孵幼虫的毒力基线。
The 3rd and 4th instar larvae and newly hatched larvae of four populations of pyrethrum, organophosphorus, carbamate and organochlorine in natural populations (AL population) Commonly used pesticide toxicity, and with the known sensitive baseline at home and abroad were compared. The results showed that the population was highly sensitive. The LD50 of the third instar larvae was lower than that of the susceptible population in the Mainland or lower than that of the susceptible population in the Mainland. In the tested pesticides, methomyl, fenvalerate, methyl parathion, The relative virulence index of phoxim and phoxim was only 016 ~ 05. Compared with the susceptible strains of India, Australia, Thailand, Indonesia and other countries, the LD50 of 4th instar larvae of AL population was significantly lower. Among the 8 tested pesticides, the relative virulence index of methomyl, cisplatin, cypermethrin, monocrotophos, deltamethrin, fenvalerate and endosulfan was only 0 09 ~ 0 4. The test also used the leaf dipping method to determine the virulence of commonly used insecticides on newly hatched larvae of this sensitive population.